I see a heckuva lot less of them than I used to. A heckuva lot less. People picking them up and keeping them. Most, just end up in a cigar box or sitting on a shelf. I'd rather leave them for the next guy and hope the next guy doesn't take them.
Some though, especially nice artifacts, I will actually not leave "exactly" where I found them but will hide them. Where I can see them again, but not likely to be found and removed.
- DAA